The ISA 828 MkII incorporates eight of Focusrite's classic mic preamps, with Lundahl LL1538 transformers on every input. Each channel has the option of mic or line inputs, while inputs 1-4 also feature instrument inputs on the front panel. Each mic pre has variable input impedance, to provide a range of subtly different sonic options when using microphones, including an 'ISA 110' setting, which replicates the impedance of the original Focusrite mic pre.
Up to 60dB of gain is available, with a further +20dB of continuously variable trim, providing a huge 80dB gain range. The high-pass filter has a fixed 75Hz frequency and 18dB / octave roll-off for minimising rumble, stand-borne noise and other low-frequency sounds. The ISA 828 MkII also features per-channel, six-segment LED meters, and switchable rear-panel insert points, which allow the use of inline processors such as compressors or EQs.
Dedicated connectors for mic and line-level inputs allow all sources to be connected simultaneously, making ISA 828 MkII perfect for permanent installation in a rack. A switching power supply allows for efficient, cool operation, without sacrificing sound quality or performance, and increasing reliability over its predecessor. The optional ISA ADN8 analogue-to-digital expansion card provides eight Dante, ADAT and AES3 outputs at sampling rates of up to 24-bit / 192kHz.And as with all Focusrite Pro products, wherever you happen to be in the world, you can rely on a three-year warranty if any Focusrite Pro hardware needs repairing or replacing due to a manufacturing fault.
Focusrite ISA 828 MkII Features
- Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
- Switching power supply design allows for efficient and cool operation
- Line inputs with dedicated input connectors and front-panel select switch
- High-pass filter with fixed 75Hz frequency and 18dB/octave roll-off
- Per-channel six-segment LED peak-level meters
- Front-panel instrument inputs to first four channels
- Switchable input impedance including classic ISA 110 setting
- Switchable insert points when used with A-D card (sold separately)
- ISA 828 MkII classic ISA mic preamp1
- Brainworx bx_console Focusrite – exclusive plug-in1
- Three Year Warranty1
- Mic inputs
- Gain range: 0dB to +30dB (30-60 switch disabled) and +30dB to +60dB (30-60 switch enabled) in 10dB steps, with an additional +20dB of continuous trim
- Input impedance: 600Ω (low), 1400Ω (ISA 110), 2400Ω (medium), 6800Ω (high)
- Max input level: +25dBu, min gain, medium Z
- Frequency response: 10Hz - 122kHz ±3dB, unity gain, medium Z (10Hz - 122kHz)
- THD+N: -91dB (0.0028%) @ -1dBr, min gain, medium Z
- EIN: -123dBu 'A'-Weighted (typical)
- Signal to noise ratio: 122dB 'A'-Weighted (typical), medium Z
- Common mode rejection ratio: 997Hz CMRR; -65dB, min gain, medium Z
- High pass filter: 75Hz knee frequency, 18dB/Octave, independently switchable per channel
- Line inputs
- Gain range: -20dB to +10dB in 10dB steps, with an additional +20dB of continuous trim
- Input impedance: 470O (low), 2.4MO (high)
- Max input level: +18dBu, min gain, low Z
- Frequency response (20Hz-20kHz): 20Hz - 20kHz ±0.1dB, min gain, low Z
- Frequency response (10Hz-110kHz): 10Hz - 110kHz ±1.2dB, min gain, low Z
- THD+N: -83dB (0.0071%) @ -1dBr, min gain, low Z
- Signal to noise ratio: 100dB 'A'-Weighted (typical), min gain, low Z
- Instrument Inputs
- Crosstalk microphone talkback: -80dB; 20Hz - 20kHz, min gain, medium Z
- Line crosstalk microphone talkback: -80dB; 20Hz - 20kHz, min gain, medium Z
- Instrument crosstalk microphone talkback: -80dB; 20Hz - 20kHz, min gain, medium Z
- Connectivity
- Front panel channel count: (2) channels in
- Front panel instrument inputs: (4) 1/4" jack inputs
- Front panel instrument inputs: (4) 1/4" jack inputs
- Rear panel mic inputs: (8) female XLR
- Line level channel count: 8 in and 8 out
- Line level input: (8) 1/4" jack inputs
- Line level output: (1) DB-25 connector (AES59)
- Digital card slot
- Compatible card: ISA ADN8
- PSU: (1) IEC input
- Operating temperatureup to 104°F (40°C)
- Dimensions (HxWxD)3.46 x 18.98 x 12.8 inches
- Weight15.55 lbs (7.05 kg)
